const path = require('path')
const CompressionWebpackPlugin = require('compression-webpack-plugin')
const port = process.env.port || process.env.npm_config_port || 8888
const cdnDomian = './dist' // cdn域名，如果有cdn修改成对应的cdn
const name = 'Blog' // page title
const IS_PRODUCTION = process.env.NODE_ENV === 'production'
const cdn = {
    css: [],
    js: [
        'https://cdn.bootcss.com/vue/2.6.10/vue.min.js',
        'https://cdn.bootcss.com/vue-router/3.0.3/vue-router.min.js',
        'https://cdn.bootcss.com/vuex/3.1.0/vuex.min.js',
        'https://cdn.bootcss.com/axios/0.19.0-beta.1/axios.min.js',
        'https://cdn.bootcss.com/js-cookie/2.2.1/js.cookie.min.js'
    ]
}
const externals = {
    vue: 'Vue',
    'vue-router': 'VueRouter',
    vuex: 'Vuex',
    axios: 'axios',
    'js-cookie': 'Cookies'
}

function resolve(dir) {
    return path.join(__dirname, dir)
}

module.exports = {
    publicPath: IS_PRODUCTION ? './' : './',
    outputDir: 'dist',
    assetsDir: 'static',
    lintOnSave: process.env.NODE_ENV === 'development',
    productionSourceMap: false,
    devServer: {
        port: port,
        open: true,
        overlay: {
            warnings: false,
            errors: true
        },
        proxy: {
            // change xxx-api/login => mock/login
            // detail: https://cli.vuejs.org/config/#devserver-proxy
            [process.env.VUE_APP_BASE_API]: {
                target: 'http://123.56.85.24:5000/api ', // `http://127.0.0.1:${port}/mock`,
                changeOrigin: true,
                pathRewrite: {
                    ['^' + process.env.VUE_APP_BASE_API]: ''
                }
            }
        },
        after: require('./mock/mock-server.js')
    },
    configureWebpack: {
        name: name,
        resolve: {
            alias: {
                '@': resolve('src'), // 主目录
                'views': resolve('src/views'), // 页面
                'components': resolve('src/components'), // 组件
                'api': resolve('src/api'), // 接口
                'utils': resolve('src/utils'), // 通用功能
                'assets': resolve('src/assets'), // 静态资源
                'style': resolve('src/style') // 通用样式
            }
        }
    },
    chainWebpack(config) {
        config.plugins.delete('preload') // TODO: need test
        config.plugins.delete('prefetch') // TODO: need test

        // set svg-sprite-loader
        config.module
            .rule('svg')
            .exclude.add(resolve('src/icons'))
            .end()
        config.module
            .rule('icons')
            .test(/\.svg$/)
            .include.add(resolve('src/icons'))
            .end()
            .use('svg-sprite-loader')
            .loader('svg-sprite-loader')
            .options({
                symbolId: 'icon-[name]'
            })
            .end()

        // set preserveWhitespace
        config.module
            .rule('vue')
            .use('vue-loader')
            .loader('vue-loader')
            .tap(options => {
                options.compilerOptions.preserveWhitespace = true
                return options
            })
            .end()

        config
        // https://webpack.js.org/configuration/devtool/#development
            .when(process.env.NODE_ENV === 'development',
            config => config.devtool('cheap-source-map')
        )

        config
            .when(process.env.NODE_ENV !== 'development',
                config => {
                    config
                        .plugin('ScriptExtHtmlWebpackPlugin')
                        .after('html')
                        .use('script-ext-html-webpack-plugin', [{
                            // `runtime` must same as runtimeChunk name. default is `runtime`
                            inline: /runtime\..*\.js$/
                        }])
                        .end()
                    config
                        .optimization.splitChunks({
                            chunks: 'all',
                            cacheGroups: {
                                libs: {
                                    name: 'chunk-libs',
                                    test: /[\\/]node_modules[\\/]/,
                                    priority: 10,
                                    chunks: 'initial' // only package third parties that are initially dependent
                                },
                                commons: {
                                    name: 'chunk-commons',
                                    test: resolve('src/components'), // can customize your rules
                                    minChunks: 3, //  minimum common number
                                    priority: 5,
                                    reuseExistingChunk: true
                                }
                            }
                        })
                    config.optimization.runtimeChunk('single')
                }
            )
        if (IS_PRODUCTION) {
            // config.plugin('analyzer').use(BundleAnalyzerPlugin)
            config.plugin('html').tap(args => {
                args[0].cdn = cdn
                return args
            })
            config.externals(externals)
            config.plugin('html').tap(args => {
                    args[0].minify.minifyCSS = true // 压缩html中的css
                    return args
                })
                // gzip需要nginx进行配合
            config
                .plugin('compression')
                .use(CompressionWebpackPlugin)
                .tap(() => [{
                    test: /\.js$|\.html$|\.css/, // 匹配文件名
                    threshold: 10240, // 超过10k进行压缩
                    deleteOriginalAssets: false // 是否删除源文件
                }])
        }
    },
    css: {
        // 是否使用css分离插件 ExtractTextPlugin
        extract: !!IS_PRODUCTION,
        // 开启 CSS source maps?
        sourceMap: false,
        // css预设器配置项
        // 启用 CSS modules for all css / pre-processor files.
        modules: false,
        loaderOptions: {
            sass: {
                data: '@import "style/_mixin.scss";@import "style/_variables.scss";@import "style/common.scss";' // 全局引入
            }
        }
    }
}
